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Weblate is a web based localization tool. In versions prior to 5.17, repository-boundary validation relies on string prefix checks on resolved absolute paths. In multiple code paths, the check uses startswith against the repository root path. This is not path-segment aware and can be bypassed when the external path shares the same string prefix as the repository path (for example, repo and repo_outside). This issue has been fixed in version 5.17.
Use CWE-22, Weblate vendor hub and Weblate product page to widen CVE-2026-40256 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-34393, CVE-2026-33435 and CVE-2026-34242 for nearby disclosures in the same product family.